Re: [swift-users] Zero cost abstraction 2D Iterator (equivalent to two nested for loops) impossible?

Perhaps the optimizer unrolls the inner loop, and thus can skip safety checks. Naively, seems trickier to do for the iterator. > El ene. 4, 2017, a las 9:10 PM, Jens Persson via swift-users > escribió: > > I noticed disabling safety checks made the custom Iterator as

Re: [swift-users] Zero cost abstraction 2D Iterator (equivalent to two nested for loops) impossible?

Thanks, I wonder if it is currently impossible to make it as fast as the nested for loops, ie that some optimizer improvement could fix it. Here's a stripped down version of my code: import QuartzCore // This is just for timing using CACurrentMediaTime() struct Point2DInt { var x: Int